bad worse the worst Historians say that Hitler was worse than Mussolini.

He was one of the worst dictators the world has ever seen.
far further the furthest Mars is further from the Sun than Earth.

Pluto is the furthest world from the Sun.
good better the best Her English was better than the teacher's.

She was the best English speaker in the class.
old (age) older / elder

the oldest

the eldest

My sister Karen is older than me.

My elder sister Karen is the eldest in our family.